Bark-stripping machine.



W. WAERN.

BARK STRIPPING MACHINE.

APPLICATION FILED N0v.22. 1918.

1 ,30 l 1 98, Patented Apr. 22, 1919.

W. Waerw.

NT FQE.

WILLIAM WAEBIN, 0F STOCKHOLM, SWEDEN.

BARK-STRIPPING MACHINE.

T 0 all whom it may concern:

Be it known that I, WILLIAM WAERN, engineer, subject of the King of Sweden, residing at 18 Rorstrandsgatan, Stockholm, Sweden, have invented certain new and useful Improvements in Bark-Stripping Ma.- chines, of which the following is a specification.

In bark stripping machines having rotating. cutter disks the change of cutters has hitherto been connected with difficulties due chiefly to the fact that the fixing and detaching of the cutters had to be efiected on the bark stripping machine. The change of cutters, therefore, involved a considerable loss of time and in addition thereto the cutter disk could not readily be properly balanced. These disadvantages are particularly prevailing in such bark strippingmachines which are provided with an outer protecting disk and in which the cutter'disk is adjustably arranged behind said protecting disk.

According to the present invention said disadvantage is overcome by fastening the protecting disk as well as the cutter disk on different concentric shafts by means of screw-threads running in opposite directions, said disksbeing so connected with each other that they may be displaced axially but not turned relatively to each other. By this arrangement, when the cutters are to be changed, the protecting disk and the cutter disk may be screwed off from their corresponding shafts simultaneously which is effected by turning both shafts simultaneously in opposite directions. In addition, the advantage is gained that the adjustment of the cutter disk may be efi'ected by a longitudinal displacement of the outer hollow shaft, while the driving shaft may be arranged in fixed bearings so that it can be coupled directly with the motor without using any transmission device.

The accompanying drawing shows, by way of example, an embodiment of the invention. Figure 1 is a longitudinal section through the bark stripping machine and Fig. 2 shows parts of the cutter disk and the protecting disk as seen from the left in Fig. 1.

The cutter disk 1 is fastened by means of threads 2 on a hollow shaft 4 through which the drivin shaft 3 is passed. Provided the cutter dis: rotates to the right in Fig. 2 said threads are righthanded ones. The protectin disk 5 is fixed to the shaft 3 by means of le thanded threads 6. The protecting Specification of Letters Patent.

Patented Apr. 22, 1919.

Application filed November 22, 1918. Serial N 0. 263,735.

disk 5 and the cutter disk 1 are connected together by means of? pins 7 which are screwed into the protecting disk and enter into axial holes 8 in the cutter disk 1, so that the protecting 'disk and the cutter disk can be displaced but not turned relativelyto each other. a The cutters 9, which are fastened to four arms 11 of the cutter disk by means of screw bolts 10, project through openings 12 in the protecting disk. -A- protecting casing 13 is arranged over the edge of the protecting disk. 1

The hollow shaft 4 is mounted at one side in anordinary'bearing 14 which allows of an axial displacement of the shaft, and at theother side in a collar-thrust-bearing 15 a i whichin turn is mounted in a fixed frame 16 insuch a way that it maybe adjusted axially". For the purpose last mentioned the cylindrical body 15 of the bearing engages the 'frame16 by means of threads 17 and is provided with a hand wheel 18. By turning the hand wheel the hollow shaft and the cutter disk are displaced longitudinally on the driving shaft. Thus, this arrangement permits of an adjustment of the depths of the out even during the operation of the machine. The driving shaft 3 is supported partly in the hollow shaft 4, partly by a fixed collar-thrust-bearing. It is driven by means of a pulley 20 but may also be coupled directly to the shaft of the motor. As the shafts 3 and 4 are coupled together by means of the bolts 7, a pulley 21 may be provided on the shaft 4 for driving other machines or apparatus, for instance the trunk forward feed of bark stripping machines.

For the removal of the cutter disk and the protecting disk from their shafts the former is provided with a hole 22 made in one of the arms 11, and the latter provided with a hole 23 said holes being arranged to register with "each other, so that a hook 24 of a. crane or the like may be introduced through said holes.

The rollers 25 arranged in front of the protecting disk 5 and on which the trunks are carried forward, are rotatably mounted in a standard 26 or the like which normally is screwed to the foundation 27 by means of a nut 28 and, as occasion requires, may be readily unfastened and turned on the shaft 29.

The change of cutters is effected in the following way. After the standard 26 has been turned down and the hook 24 inserted in the holes 22 and 23 the shafts 3 and 4 are turned simultaneously in opposite directions by means of spanners or levers. The cutter disk 1 and the protecting disk 5 are then,.

evidently, pushed off their shafts 4 and3as a Whole so that, finally, they are hanging freely in the hook 24 The disks are then removed and a previouslyready,made cutter,

disk With sharp and Well balanced cutters together: with a protecting disk 5 coupled therewith are brought in position to be screwed) on the shaftsflv and; 4', which is effected by 'turningi the shafts-simultaneously in opposite: directions; Afterhaving adj ust GdQthBCdBpth ofi'th'e eutby turnihg the hand WheeL 118. the standard: 26 is screw-edifaste in,

anaupright 11081131011 and the machine is immediatelyiready for use;

Having :n'ow; particularly described my inventioni and: iii What manner. the same is to be performed, I declare that What I? claim 1s "1. In; barkz strippingrmachines having a cutter disltandya: protecting diskiniountedi one on the shaft; of the machine and: the othenon 'ajhollowi shaft: arranged. concent'i'i cally therewith ythearrangement that the cutter; disk; and the." protecting: disk are fas like Which bearing is mountedin a bearing in a fixed: frame andfco'nneotedi to the latter by means ofscrew-threads; so that the hol 10W shaft: may. be displaced. axially by turning the collar-thrustebearing:.

3'. In a bark stripping. ma'chine asiel-aimedi iniclaim 1, the arrangement that'itheparts ofz the machine Which are located in front; of:

the putter disk and which serve to. carry and to. guide the trunks,-. are provided! on; a

swingable' frame, so that the. cutter disk. may

be. readily removed from .theshaft'.

In testimony whereofzliaifix my signature in presence of two Witnesses.v

WIIa lAlYt A -N? Witnesses: V

' J acon BAGGE,

CHARLES: HLYLAFZELY."

Q l i iillewntmemzhe b in; rzfiv cents each, y dd ess enimits on at s;

" Washington, D. C V 

